The shorter deals were set to go live a fortnight ago, but had to be delayed due to testing not being completed.

"The launch of SIM only plans [due 9 November] will be delayed by a few days as a result of our comprehensive testing process over-running slightly," read a statement from EE at the time.

The new SIM-only pricing works out to be £15 cheaper per month than the equivalent two-year bundles, resulting in an annual savings of £180.

The new tariffs all come with unlimited calls and texts, and start at a monthly rate of £21 for 500MB of data, £26 for 1GB, £31 for 3GB and £36 for 5GB. There 8GB option, with the maximum data allowance remaining tied to 24 month contracts.